BUS YOUR OWN TRAY: On the Virtue of Brevity in Email

spiegelman:

This conflicts with an older style of correspondence that associated pleasantries with tact. Tactful emails now are efficient, and pleasantries are a waste. People accustomed to pleasantries see their absence as rude, or a sign of being cross. They infer a tone that isn’t there, while people accustomed to brevity know how difficult it can be to ascertain tone from an email.